View Code of Problem 30

#include<stdio.h>
int main()
{
	int n,sum=0;
	//scanf("%d",&n);
	while(scanf("%d",&n)==1)
	{
	int i=1; sum=0;
	for(i=1;i<=n;i++)
	 {
	 sum=sum+i;}
	 
	 printf("%d\n",sum);}
	 return 0; 
}